Liquid packing for pumps.



J. V. 0. PALM.

LIQUID mcxme FOR PUMPS. APPLIOATIbH FILED JULY 25,1907.

Patenfied Feb. 16, 1909.

1 and thereby reducing to a UNITED STATES PATENT OFFICE.

JOHN V. 0-. PALM, OF MILWAUKEE, WISCONSIN.

LIQUID PACKING FOR PUMPS.

I No. 912,321.

* frictionbetween the piston andits cylinder and avoid detrimentalactionon the working parts of dust or he like contained in the material beingpuniped.- In

This invention is particularly designed for use with, suction cleaningsystems where a low degree of-suction is required and'wherethe'presence-of dust in the air being pumped constitutes. a seriousobstacle to the. use'oftight fittingpistonsbecause of the erosive Eaction-of the'dust on the-working surfaces.

-Theflowing liquid packing provided by] this invention' 'issufficientlyeffective ,to pens,

miter the-,low degree OfsuctiOn-beingat tainfed and serves to avoidthenece'ssity for having a pist0nQ3i-lb0Sely mounted therein 'In thisdrawing, .1- represents "56gb; fittin fr-elation between the piston itscylin' er,'while carlyingfofiiany par ticlglsjof dustthat maycomein'contact there: ,w'it

' With the above-ahd other objects in view,- t'he invention consists inthe claimed, andgall equivalents. 1

The figure of the accompanying drawing represents aisectional elevationof apump' constructed in accordance with thisinven tion, with partsarranged in,-thejs ame plane .40

for conveniehce of illustration; s

x a base to; which is reniovably secured" a cylinder 2' withasIightfcIearance onall sides, the piston rod working ina-stationaryguide 4; to. prevent its contacting with the wallsof thecylinder. Anai-r passage 5 in the base opens to the interior-ofthecylinder at the axis thereof and communicates with a valved in let pipe6 and avalved outlet pipe 7, the former desirably connecting with thesuc-.

tion nozzle of a cleaning system and the latsource of septia;

ter connecting with a discharge pipe 8 leada ing to a sewer or otherplace of disposal.

A water pipe, f m the city mt ins or other lClGl pressure, connectsSpecification of I lptters Patent. Application filed July 25, 1907.Serial No. 385,581.

pump herein Patented Feb. 16, 1909.

REISSUED with an annular space 10 formed in the walls cylinder is of,'asufficient quantity and under such a pressure that it will force its wayupwardly as well as downwardly in the slight clearance space allowedbetween the piston and itscyl-inder and constitutes a film-like packingfor the piston. "The water which passes downwardly is collected in'anannular chamber 11 formed in the base and communicating through apassage 12 with a valved; outlet pipe 13 leading to the dischargepipe 8,before referred to. LThe water which passes upwardly from the annularspace 10 is deflected the. outwardly turned rim 14 of the iston and is.collected in a trough'15 forme about the upperend of. the cylinder fromwhich it is conducted through a pipe 16 to the dischaii'ge pipe 8. v-The base lhas a conical portion .7

face rising from thecircular grooveorrecess'which forms the-annularchamber 11 I Y which 1 lies beneath the piston with its inclined surofthe cylinder 2 at about midway the length j thereof, and the water thusdelivered to the and having the air passage 5 opening at its apex.-; Theconical portion, 17 serves to -.sh'edwaterjwhichizmlay be splashedthereon into-the- -'su'rroi1nding chamber 11- and the shape of'fthej'piston end which corresponds "therewith servesto form a drip.flange to- .prevent the water running toward the centef-where it mightfall into the air' passage 5,."it being anobject'to avoid the admissionof water to the air passage where itmight interferewith the properoperation of the chek valves. Thelower end of the cylinderis'des'irablygrooved to complete the forma-.

anon ofthe annular chamber 11 and to provide a depending drip flange 18which will further assist in" avoiding a splash of the preferably at acomparatively high speed, and the water under pressure is admittedthrough the water pipe 9 to form the packing between the piston and, itscylinder so that thepiston will-cause air to be drawn in through thevalved inlet pipe 6 andto be forced out through the valved outlet pipe7,

the'valvesof these parts in practice being preferably located as closeto the piston as possible to reduce the dead air space. Durthe upwardstroke of theplunger the doivnward flow of water will be somewhatincreased, owing to the suction created 111 .water that would permitittoreach the air passage 5. In operation the piston 3'is rec 1procated,

' the check valve in the outlet pipe 13, and

become thoroughly mixed and the dust is taken from theair so that whenconveyed to a seweror the like there is no objection-' able discharge'of dust.

of the piston, and a receiver for collecting the cylinder and to thereduced resistance to l the flow of water in that direction,consequently provision is made in taking care of the streams of water atboth ends of thecylinder to avoid undue splashing, the formation of theannular chamberll being such as to deflect the stream outwardly andprevent its splashing into the air passage and the formation of thedownwardly curved rim 14: of the piston being such as to deflect thewater downwardly into the trough 15 and avoid itsbeing splashed outsidethereof.

During the suction stroke of the piston the water in the 'passage 12 isprevented from being drawn back into the cylinder by the speed of thepiston is such that there is not sufiicient time during the suctionstroke for water to back up behind this check valve to a degree thatwould enable it to reach the air passage 5.

By means of this invention an air pump is provided which not only isrelieved from retarding friction of a tight working piston, but which isalso free from the scratching and'clogging effect of dust in the airbeing pumped, and the usual strainers between the pump, and the suctionnozzle may therefore be dispensedwithand their objectionable featureseliminated. By removing'the dust ladened air and water together theyWhat I claimas new and desire to secure by Letters Patent is:

1. A reciprocating piston pump having a clearancespace'between thepiston and its cylinder and means for introducing a constant flow ofliquid into the clearance space to form a packing for the piston.

2. A reciprocating piston ump having an unconfined clearance spaceetween the piston and its 0 linder and means for supplying a constantfiow of liquid to said clearance space and for collecting it therefrom.

3. A pump, comprising a cylinder having inlet and outlet ports, a pistonloosely mounted in the cylinder with a'clearance space therebetween,means forsu'pplying the clearance space with flowing liquid at anintermediate part of the cylinder, and means for collecting thedischarged liquid at both ends of the cylinder.

e. A pump, comprising a valved vertical cylinder, 2. piston looselymounted therein, means for-causing liquid under'pressure to flow throughthe space between the piston and the cylinder and constitute a flowingpacking, a deflecting flange at the upper end the liqilid deflected.thereby.

5..A pump, comprising a valved vertical cylinder, a piston looselymounted therein,

means for supplying liquid under pressure to flow through the spacebetween the piston and the cylinder and constitute a flowing packing, adeflecting flange at the upper end of the piston, a flange on the upperend of the cylinder forming a trough to receive the .liquid deflected bythe deflecting flange, and

a conductor for discharging the water from the trough.

6. A pump, com rising a valved vertical cylinder, a piston ooselymounted therein, means for delivering liquid under pressure to .flowthrough the space between the piston and the cylinder and constitute aflowing packing, anannular chamber formed at-the lower-end of thecylinder to collect the liquid, and valve-controlled means for conveyingthe liquid therefrom.

- 7. A pump, comprising a vertical cylinder, a piston loosely mountedthere'in with a space therebetween, means for admitting liquid to thespace between the piston and the cylinder to form a packing, a chamberat the lower end of the cylinder to collect the liquid,. and means fordischarging liquid from the upper end of the cylinder and from thechamber.

8. Apu'mp, comprisin I a vertical cylinder, a piston loosely mountedtherein, means for admitting flowing liquid between the piston and thecylinder to form a piston packing, a base closing the end of thecylinder and having a valved air passage opening to the cyl-' inder, acollecting chamber in the base surrounding the mouth of the air passage,and valved means for conducting. the liquid from the collecting chamber.

9. A pump, comprising a cylinder, a piston loosely mounted therein witha space therebetween, means forintroducing flowin liquid to the spacebetween the piston and I the cylinder, a base closing the end of thecylinder and having a valved air passage opening to the interior of thecylinder, a conical guard on the base' surrounding the month of the airpassage to shed liquid therea from, a collecting chamber surrounding theconical guard, and a valved conducting -means through which the liquidmay be discharged from the collecting chamber. 7

10. A pump, comprising a cylinder, a 'piston loosely mounted therein,with a space the'rebetween, means for introducing flowing liquid to thespace between the piston an guard on the base surrounding the mouth ofthe air passage to shed liquid therefrom, a

the cylinder, a base closing the end of the 1 collecting chambersurrounding the conical guard, a valved conducting means through whichthe liquid may be discharged from the collecting chamber, and a dripflange on the lower end of the piston.

, ton loosely mounted therein with a space therebetween, means forintroducing flowing liquid'to'the space between the piston and thecylinder, a base closing the end of the cylinder and having an airpassage opening to the interior of the cylinder, a. conical guard on thebase surrounding the mouth of the air passage to shed the liquidtherefrom, a collecting chamber surrounding the conical guard, a valvedconducting means through-- which the liquid may be discharged from thecollecting chamber, and a depending flange on the lower end of thecylinder 'to prevent the liquid splashing into the mouth of the airpassage. 12. A pump, comprising a cylinder, a piston. loosely mountedtherein with a space therebetween, means for introducing flowing liquidto the space between the piston and the cylinder, a base closing the endof the cylinder and having an air passage opening to the interior of thecylinder, a conical guard on-the base surrounding the mouth of theairpassage to shed liquid therefrom, a collecting chamber surroundingtheconical which the liquid may be discharged from .the collecting chamber,a drip flange on the lower end of the piston, and a depending flangeonthe lower end of the cylinder to prevent the liquid splashing into themouth of the air passage.

and outlet ports, and means for collecting 13. A pump, comprisinga-vertical' cylinder, a piston loosely mounted therein with a spacetherebetween, an annular space formed in the walls of the cylinder at anintermediate part thereof, means for admitting liquid to the annularspace to constitute a flowing liquid packing forthe piston, and meansfor dlsch'arging the liquid at the ends of the cylinder.

'14. A pump, comprising a cylinder a iston loosely-mounted in thecylinder wit a space therehetween, means, for admitting flowing liquidto the space between the iston and the cylinder, means for collectingthe liquid.- at the ends of the cylinder, and av guide for the piston toprevent its engagement with the walls of the cylinder;

15. A ton loosely mounted therein with a space therebetween, means foradmittin' flowing liquid to the space between the P1513011 and thecylinder to constitute a packing, the

cylinder being provided with valved inlet the liquid from the ends ofthe cylinder an into which the outlet port discharges. guard, a valvedconducting means through In testimony whereof, I aflix my signature, inpresence of two witnesses.

JOHN V. O. PALM.

wpump, comprising a cylinder, a pis-

